Stability testing apparatus



Oct. 13,- 1931. G. E. CHATILLON 1,825,732

-STABILITY TESTING APPARATUS Filed June 2a, 1928 2 Shets-Sheet 1 mwmw iA TTOR/VEV ,1931. I G. E. CHATILLON 1,326,732

I STABILITY TESTING APPARATUS Filed June26. 1928 2 Sheets-Sheet 2.

M. BTW

ATTORNEY The dial of the scale is provided with'a push Patented Oct.13,1931

1 UNIT D-sures PATENT. OFFICE GEORGE CHATILLON, OF NEW YORK, N.YQASSIGNOR TO JOHN CHATILLON & SONS, 01'

.-NEW YORK, N. Y., A CORPORATION OF NEW YORK STABILITY, TESTINGAPPARATUS Application filed June 2c, 1928. Serial 110.288352.

This invention relates to improvements in apparatus for testing thestability of plastic and semi-plastic materials and has for its objectto provide a simple andefiicient apparaata made upon a test specimenmaintained at a constant temperature and supported in a mold equippedwith a snugly fitting plunger. Stability is measured, preferably inpounds, by the maximum load required to force the mixture through asmallorifice in the bottom of the mold.

According to a feature. cf the invention, the load is applied to thetestspecimen, while mounted on a scale, by rotating a hand wheel at acontant rate of speed to cause the plunger to descend and compress thespecimen uniformly. When the limit. of stability is reached the materialcommences to exude through the orifice in the bottom of the mold.

pointer which registers the maximum load attfined during test, and thisvalue is recorded as the stability, or resistance to displacement, ofthe test specimen. v

The invention will be described in connection with the accompanyingdrawings in which, 1 i

Fig. 1 is a front elevation showing the preferred construction of thetesting apparatus; and

Fig. 2 is a side view, partly in section, thereof.

' The testing apparatus includes a scale 10 of any suitableconstruction, and an actuating device 11 for applying the load to thespecimen under test, as hereinafter described.

The scale 10 includes a platform 12; pitmen 13 communicating with ascale beam 14 inside the casing15; connecting rod 16; coil springs 17; arack 18 cooperating with a pinion on an indicator 19; a push pointer 20:and a graduated dial 21.

The material to be tested is preferablyin the fornr of acylindricalbriquette, illustrated at 22. In testing semi-plastic asphalt pavrngmixtures a cylindrical test specimen two mches in diameter and one inchhigh has been employed. The test specimen is preferably mixed andcompressed at. the same temperature used. 1n laying the pavement.

The briquetteis placedin a cylindrical mold' 23 having an annulartesting ring 24 supported at the lower end thereof by means of aclamping collar 25. A plunger 26 fits snugly into the mold 23 as shown.

Paving materials'ar'e preferably tested at a temperature approximatingthe pavement temperature inhot weather, since they are SHbJGCt' tomaximum displacement under such conditions. The briquette 22 istherefore preferably tested in a tank 27 of hot water 'containingelectric heating elements 28v adapted to maintain the water at thedesired temperature. The tank 27, with the elements arranged as shown,is mounted on the scale platform 12.

The actuating mechanism 11 is mounted on cross bars- 28 and 29 supportedbetween end frames 30, and includes a. hand wheel 31 adapted to berotated to actliate a vertical shaft 32 provided with a testing head 33.The rotary movement of the hand wheel 31 in a clockwise direction iscommunicated by means of gears 34 to shaft 35 and thence by means ofpinion 36 and internal gear 37 to a threaded bushing 38 cooperating withthe threaded shaft 32, causing the shaft 32 and thetesting head 33 todescend.

A bushing 45 mounted between cross bars 28 serves to guide shaft 32.This bushing 45 is not threaded and is fixed with respect to bars 28. Awasher 46 is'disposed on shaft 32 between bushing 45 and threaded bush-'ing 38.

In operating the testing apparatus the ML 'quette to be tested is placedin the testing mold 23 and forced to the bottom of the mold by theplunger. The whole assembly is then placed in' the'center of the bath,mounted on the platform 12, and brought under the ter of the plunger.The hand: wheel 31 is testing head 33 in such a manner that the 1 ballend of the testing head engages the cen then rotated, for example, at aspeed of one said specimen through thev opening in the revolution persecond, causing the testing head 33 to force the plunger 26 against thebriquette 22 at a uniform rate approximating one inch in twenty-fiveseconds The revolutions of the .hand'wheel 31 may be timediwith ametronome set to heat at halfsecond intervals, a lug 39 on the handwheel engaging a flexible pin 40 to click ateach revolution. The loadthus applied to the briquette 22 registers on the dial 21. The pushpointer 20 registersthe maximum load attained during the test, which isreached when the material commences to exude through the orifice in. thetesting ring 24. This value represents the stability value, orresistance to displacement, of the material under test.

The apparatus is simple in construction,

with all parts readily accessible for operation or adjustment. The testis accurate since the load is applied uniformly at a constant rate ofspeed. 1

It is evident that the invention is capable 'of various modificationsand adaptations within the scope of the appended claims.

I claim:

1. Apparatus for testing the stability of plastic and semi-plasticmaterials and mixtures comprising a scale, a mold having an orifice inthe lower portion thereof adapted to receive a test specimen moupjed onsaid scale, a plpnger acting in said mold, means for actuating saidplunger to load the test specimen, an indicator on said scale, and a ushpointer actuated by said indicator to indicate the maximum resistancedeveloped in forcing a portion of said specimen through the orificeinsaid mold.

'2. Apparatus for testing the stability of plastic and semi-plasticmaterials and mixtures comprisin a scale having a horizontal platform, amold havin an orifice in the bottom thereof adapted t receive a testspecimen mounted on said platform, a vertical plunger acting in saidmold, a vertical shaft adapted to contact with said plunge gmeans forlowering said shaft at a constant rate of speed to cause said plunger toload said specimen uniformly,an indicator on said scale to mold.

Signed at New York city, in the county of New York and State of New Yorkthis 21st day of June, A. D. 1928.

' GEORGE E. CHATILLON.

indicate the force applied 4:0 said specimen,

and a push phinter actuated by said indicator toindicate the maximumcompression revquired to force a portion of said specimen through theorifice in said mold.

3. Apparatus for testing the stability of plastic and semi-plasticmaterials and mixtures comprisin a-scale, a mold adapted to i sistancedeveloped in forcing a portion of receive a test spe imen mounted onsaidscale,

